Senco DS300-AC Duraspin 3300 RPM Flooring Collated Screwdriver 3,300rpm high-torque motor drives from 1-1/4" to 3" screws Easy depth of drive adjustment regulates the precise amount of countersink Fast and simple height adjustment from 31.5" to 41.5 ". To adjust for any height person.Each kit comes complete with tool,two spare drive bits, and a rugged carrying case, Trigger lock with reverse for continuous work Fast easy 50 screw strips to speed up production.